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Summer Temperatures of the Soil Surface and Their Effect on Survival of Boll Weevils1 in Fallen Cotton Squares2

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Mortality in populations of immature boll weevils, Anthonomus grandis Boheman, in fallen cotton squares on the soil surface commenced when the summation of the index of time (1-hour period) X temperature >38°C reached 60. All the weevils died when the summation reached 550. Soil surface in Arizona cotton fields attains a mean temperature of 38°C when the mean air temperatures arc 30°C. Soil surface temperatures of 38°C are com mon when air temperatures are lower than 30°C and may reach 60°C when air temperatures are at maximums. Frequent and prolonged periods with temperatures >38°C impose a strong bioclimatic control on the boll weevils until late season, when shading by maturing cotton plants enables the survival of the immature weevils in the squares on the soil surface.

Document Type: Research Article

Publication date: October 1, 1970

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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